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1、Int.J.FatigueVol.20,No.2,pp.145±154,1998Ó1998.PublishedbyElsevierScienceLtd.AllrightsreservedPrintedinGreatBritain0142±1123/98/$19.00+.00PII:S0142-1123(97)00098-4FailureanalysisandpreventioninSCCandcorrosionfatiguecasesKenjiroKomaiDepartmentofMechanic
2、alEngineering,KyotoUniversity,606-01Yoshida-honmachi,Sakyo-ku,Kyoto,JapanFailurecasesconcerningstresscorrosioncracking(SCC)andcorrosionfatigue(CF)havebeensurveyed,andtheoveralltrendofthecasesandcorrectingmeasuresweresummarized.60%ofSCCoccurredinstainl
3、esssteels,andspecialattentionshouldbepaidwhenstainlesssteels,aboveallausteniticstainlesssteels,areused.InmostcasesofSCC,residualstressinducedbyweldingandchlorideenvironmentwereimportant,andthetimetoSCCfailurewas1to2years.Themostimportantcorrectivemeas
4、ureinSCCcaseswasmaterialchange.HalfofthestresssourcesinCFcasesweremechanicalstress,butspecialattentionmustbepaidthattheremaining45%,whichwerecausedbyresonanceand/orvibrationandcyclicthermalstress.ThemostimportantcorrectivemeasureinCFcaseswasstructural
5、modi®cationtolowerthestressconcentrationanddesignstress.Ó1998ElsevierScienceLtd.(Keywords:failureanalysis;stresscorrosioncracking;corrosionfatigue)INTRODUCTIONThecharacteristicfeaturesofSCCcaseswithrespecttothematerialcategoryaresummarizedasfollows.Co
6、llectionsoffailurecasesandtheiranalysesperformWithcarbonsteels,anumberofcaseswerefoundintwotasks.Firstly,theyprovideapracticalopportunitypressurevessels,tubes,pipesandendplateofshells.toemploystateofthearttechnology.Secondly,theyMostlivestofailureswer
7、elessthan2years,butancontributetofundamentalresearchactivitiesbyindicat-accidentoccurredafter10yearsuse.Asforenviron-ingunexpectedin¯uentialfactorsinlaboratoriesaswellmentalfactors,alkalineandhydrogenenvironmentareasdictatingthefuturetrendofengineerin
8、gresearch.concerned.ThecrackingwasfoundattemperatureThoughfailurecasescausedbyenvironmentalfac-rangelowerthan50°Caswellastherange50±torsarewidespread,onlyasmallnumberhavebeen150°C.Mostofthestresssourceswereresidualstressespublished.Inthepresen
